exam Maths Puzzle Numerical Ability

need help finding the domain for y=1 over three x

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exam Other Question

(-3x+7)-(5x-6) The winning candidate had 220 more votes then the loser, if 810 votes were cast in all how many votes did each candidate receive
I put x= winning candidate and y= the losing candidate x + y= 810
y = 2x+ 220 this is where I get lost